Connected-coding Retransmission Scheme for Low-density Parity-check Codes in 5G

Aiming at reducing unnecessary packet losses of transport block (TB) level hybrid automatic repeat request (HARQ), we propose a connected-coding retransmission (CCR) scheme for low-density parity-check (LDPC) codes in 5G data channels. Once the transmission of a TB, which is divided into one or several code blocks (CBs), was failed, we introduce failed CBs information into the parity bits of the new CBs by connected encoding. Then error correction for the failed CBs is achieved again by connected decoding to avoid packet losses. The simulation results in fading channel demonstrate that the proposed scheme efficiently improves both CB error rate performances and system throughput performances.